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Car Forum / MINI / March 2006Finding out what Diff Ratio you have fitted
Is there any way of finding out what Diff Ratio is fitted without actually counting the teeth? > Is there any way of finding out what Diff Ratio is fitted without actually > counting the teeth? Yes it involves jacking a wheel up, sticking the car in fourth and then counting how many times the engine turns exactly(might be easier with spark plugs out of course!) I think you might have to do a bit of maths to allow for idler gear ratios if you have anything abnormal but I don't think they make a great deal of difference as you have a few ratios that are standard 3.44 ,3.105, 2.9 etc Hope that made some sense! miniman Do you mean 1 revolution of the engine to 3.44 of the wheel? > > Is there any way of finding out what Diff Ratio is fitted without actually > > counting the teeth? [quoted text clipped - 9 lines] > > miniman no i think he means 3.44 engine to 1 wheel ???? if not at 6000 rpm the wheels will be doing 18,000 + rpm ???????? > Do you mean 1 revolution of the engine to 3.44 of the wheel? > [quoted text clipped - 12 lines] >> >> miniman Yep It would be about 3.44 engine to 1wheel(discounting idler gear variations!) I have a 3.105 diff which has 59teeth and the pinion has 19teeth It should be reasonably easy to guesstimate the fractions of a turn on your pulley by marking it with something bright so you can see how far it goes round! I am tempted to fit a 2.9 now my supercharger is running sweetly, it is a bit noisy on the open road at anything above 80mph! miniman http://homepages.nildram.co.uk/~deffee/index.html (click on it, you know you want to!) > no i think he means 3.44 engine to 1 wheel ???? > [quoted text clipped - 15 lines] >>> >>> miniman My 998 cc 1984 Mini had a small square red sticker on the diff: FB 20/59. 59 devided by 20 gives 2,95 and that's the ratio. If you are lucky your diff has a sticker on it, so i suggest you look for it now! John Holland > Is there any way of finding out what Diff Ratio is fitted without actually > counting the teeth? |
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